Add a continuous (scrolling) mode view
Current musescore view displays the notation in a A4 (or other size) paper. This is fine when creating music sheets. But this is not very handy when it comes to writing music and frenquently playing it back. Under Windows, I used Finale wich has a continuous (or scrolling) display mode. In this mode, the staff never breaks (no "carriage return") so doing play back always scroll the staff from right to left, letting one to concentrate on the notes and not to the location where the notes will be displayed.
I think that adding a view menu option would come handy. This view menu would have two entries "page mode" and "scrolling mode". The "page mode" would be mapped to the current view implementation. The "scrollin mode" would switch to the new mode.